Re: linux-next scsi-mq hang in suspend-resume

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On 07/12/2017 08:51 AM, Tomi Sarvela wrote:
> Hello there,
> 
> I've been running Intel GFX CI testing for linux DRM-Tip i915 driver, 
> and couple of weeks ago we took linux-next for a ride to see what kind 
> of integration problems there might pop up when pulling 4.13-rc1. 
> Latest results can be seen at
> 
> https://intel-gfx-ci.01.org/CI/next-issues.html
> https://intel-gfx-ci.01.org/CI/next-all.html
> 
> The purple blocks are hangs, starting from 20170628 (20170627 was 
> untestable due to locking changes which were reverted). Traces were 
> pointing to ext4 but bisecting between good 20170626 and bad 20170628 
> pointed to:
> 
> commit 5c279bd9e40624f4ab6e688671026d6005b066fa
> Date:   Fri Jun 16 10:27:55 2017 +0200
> 
>     scsi: default to scsi-mq
> 
> Reproduction is 100% or close to it when running two i-g-t tests as a 
> testlist. I'm assuming that it creates the correct amount or pattern 
> of actions to the device. The testlist consists of the following 
> lines:
> 
> igt@gem_exec_gttfill@basic
> igt@gem_exec_suspend@basic-s3
> 
> Kernel option scsi_mod.use_blk_mq=0 hides the issue on testhosts. 
> Configuration option was copied over on testhosts and 20170712 was re-
> tested, that's why today looks so much greener.
> 
> More information including traces and reproduction instructions at
> https://bugzilla.kernel.org/show_bug.cgi?id=196223
> 
> I can run patchsets through the farm, if needed. In addition, daily 
> linux-next tags are automatically tested and results published.

Christoph, any ideas? Smells like something in SCSI, my notebook
with nvme/blk-mq suspend/resumes just fine.

-- 
Jens Axboe




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